Most painters have no problem painting doors in place, but they recommend you lay the door on sawhorses and work horizontally. If you have a paneled door, start with the panels and work from the outside edges in toward the center. "Watch the corners — paint loves to puddle," warns Dixon. While the paint is still wet, lightly "tip off" the panel with an almost dry brush. (Tipping off is pulling the brush over the surface to level out the finish.) When painting the stiles (vertical) and rails (horizontal) just follow the grain of the wood. When the grain changes abruptly, for instance, where the rail meets the stile, don't stop your brush stroke — you'll only leave a lump of paint. Apply paint across the joint with a full stroke, and then tip off the overlapping section by pulling the brush in the direction of the grain. "Make sure the door is dry before painting the opposite side or rehanging it," says Maceyunas.
You are right on with this - why do people leave switch plates on when it's just so easy to take them off? Another thing that happened to us - we had the popcorn ceiling taken off and the ceiling painted white. When the job was done and I later went to change out all the fixtures/fans, they had left every fixture in place, so there was a large patch of popcorn and unpainted ceiling left behind - it just didn't dawn on me to specify that they take those down before scraping and painting. It was kind of a mess.
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Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.